Influence factors analysis of removing heavy metals from multiple metal-contaminated soils with different extractants |
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Authors: | Wen-bin Xia Xin Li Hui Gao Bao-rong Huang Hui-zhi Zhang Yun-guo Liu Guang-ming Zeng and Ting Fan |
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Affiliation: | (1) College of Environmental Science and Engineering, Hunan University, Changsha, 410082, China |
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Abstract: | Some key factors on the heavy metals removal efficiencies were studied when soil washing technology was used in the remediation
of soils contaminated by multiple heavy metals. The results show that the dissolubilities of Cu and Zn are promoted by humic
acids, but Pb and Cd are inhibited by humic acids; heavy metals in the clay are more difficult to be extracted than silt;
the strong acidic soils can cause the protonation of EDTA and weaken its extracting ability; EDTA is effective for extracting
Pb and Cd, while oxalate (OX) is effective for extracting Cu and Zn; and biosurfactant can be used as additive to improve
the removal of some particular heavy metals.
Foundation item: Project(20050532009) supported by the Doctoral Foundation of Ministry of Education of China; Projects(2006BAD03A1704, 2006BAD03A1706)
supported by the National 11th-Five Technology Supporting Project |
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Keywords: | heavy metal soil remediation extraction rhamnolipid |
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